Q 2501801728.     The measured freezing point depression for a `0.1 m` aqueous `CH_3COOH` solution is `0.19^0C`. The acid dissociation constant `K_a` at this concentration will be (Given, `K_f` the molal cryoscopic constant `= 1.86 K kg mol^(-1)`)

WBJEE 2013
A

`4. 76 xx 10^(-5)`

B

`4 xx 10^(-5)`

C

`8 xx 10^(-5)`

D

`2 xx 10^(-5)`

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